<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    // 1.定义变量，变量类型，变量名 = 变量值
    var num = 1;
    var score = 65;
    var name = "zjz";
    // alert(name);
    // 2.条件控制
    if(score>60&&score<70){
      alert("及格");
    }else if(score>70&&score<80){
      alert("良好");
    }else {
      alert("other");
    }

    console.log(score);




  </script>
</head>
<body>

</body>
</html>